However Julia Roberts thought her appearance on 'Late Show' (Weeknights, 11:35PM ET on CBS) might go, it all went completely out the window when Tom Hanks ran onto the set asking if he could play.

He joined David Letterman on a trivia-based question for Roberts. Letterman asked her questions about Hanks, and Hanks had the answers already written down on sheets in his lap. Except, even this didn't go as Roberts might have expected.

"How many children does Tom have?" Letterman asked. Julia's answer: "Four, as far as he knows." Tom's answer: "Honestly, no idea. Actually, she got that one the closest."

"Is any of this really going to get people to go see our movie?" she asked between peals of laughter.

"Nobody does this show to get people to see their movie," Hanks quipped.

It was certainly a fun bit, and made even more fun by Roberts clearly not being in on the gag as it went along. After all, it was her big smile and laugh that first made her famous way back in 'Pretty Woman,' so why not see both beautifully and naturally on display again?

Kind of makes you want to go see 'Larry Crowne,' doesn't it? Oh, that's the movie she was promoting. Didn't you get that? It stars the actor Tom Hanks thinks is the finest of his generation!

I hope we don't have for more years of the man in charge. But so far we have not put up jack ____. That can run against him. Our choices suck. Id rather have Hillary run... We new what we got out of Billy boy...

I KEEP READING THESE NEGATATIVE BLOGS AND I HAVE A FEELING OUT OF THE 310 MILLION PEOPLE THIS IS MOST OF THE PEOPLE THAT DO NOT LIKE THIS WONDERFUL PAIR OF ACTORS, THEY ARE SPECIAL, THEY ARE GREAT ACTORS, AND HAVE BEEN GOOD HUMANITORIANS......TOM HANKS IS SOMETHING SPECIAL...FOR ALL YOU NEGATATIVE PEOPLE ON THESE TWO, I BET YOU THINK SARAH PALIN IS SMART...NOT